Student and Professor

The student who went to university canteen sat down near the proffesor due to all seats were full.Profesor angrily told him"The birds and oxes do not sit together".Student answers"So i flew."
The proffesor got so nervous because of this answer.He did what he can do to make the student be unsuccessful in the exam.However the student answered all the question excellently.Professor told the student he would like to ask him a question."Imagine that you found two boxes while you were walking on the road.In one of them was intelligence,in other one money.Which one would you select?Student answers"I would choose the one which was money in."The proffesor answers i would choose intelligence." The student says"Naturally,everybody takes whatever he needs."

Professor got so angry after this answer.He wrote "OX" on the exam paper instead of his mark.The student came in the room of professor after a while."Professor you had signed the paper but forgot to write my mark."